"Michael Beschloss posted this remarkable photograph of the Lower East Side on Mulberry Street, a rare color photo made around 1900. There is a lot of life going on here--people posing for the photographer (standing on an elevated platform with a large view camera, no telling who or what he was imaging), people caught in their daily lives, people. Under the Paper Microscope the image reveals all sorts of sub-images, photos-within-photos, making it a fascinating exercise in exploration."
— Ptak Science Books
And here's a stroll down Market Street in San Francisco (1906).